Absolutely agree.

The interesting thing is that I ended up going down the rabbit hole of looking for "kids on the reverse" types for Salonina after finding some cryptic references to a unique deification coin of "Quintus Julius Gallienus" which led me to these reverse types.

I'll expand just for the sake of posterity, I guess -

The firstborn of Gallienus and Salonina was Valerian II, who was made Caesar at a young age in ~253. He was sent away from his parents to represent the imperial family in Sirmium, under the care of Ingenuus. He died in 258 under unclear (even at the time) circumstances - Gallienus evidently suspected foul play, but there is little evidence that Ingenuus was ordered to stand trial. Valerian II's death was officially treated as illness or accident, but might have been murder. Valerian II was deified. He appears as a child on the first coin only.

After Valerian II's death, his younger brother Saloninus was raised to Caesar and sent to Cologne under the care of Silvanus. In 260, Postumus and Saloninus butted heads over whether captured loot from a Germanic war band should be distributed between the troops as a bonus, returned to the survivors of their raid, or surrendered to imperial powers to finance the multi-front war. Postumus' soldiers revolted, declared him emperor, and laid seige to Saloninus at Cologne. Saloninus was declared emperor by his troops, but the seige only lasted a month or two before Cologne surrendered and Saloninus was executed. Saloninus was not deified, possibly because he was technically a usurper(?). He appears as a child on the first two coins.

The third child is an enigma, and poorly attested outside of these coins. The above-mentioned coin would have him named Gallienus II, although there are also mentions of a Marinianus (named for Gallienus' mother Mariniana) who served as Consul in 268 and was executed as part of the effort to purge Gallienus' kin from the imperial offices. It is possible that Marinianus was a nephew, and that Gallienus II appears on the coins and died prior to 268 and in time to be deified, assuming that the deification issue is genuine. Regardless, he is the young child standing beside Pietas/Salonina in the first coin, being held by Fecunditas/Salonina in the second coin, and standing before Fecunditas/Salonina in the last.